* {
  margin: 0;
  padding: 0;
  list-style: none;
}

table {
  margin: 0 auto;
}

table, tr, td {
  border-collapse: collapse;
  border: 1px solid #000;
  text-align: center;
}

td {
  width: 100px;
  height: 30px;
}

.add {
  width: 100px;
  height: 30px;
  line-height: 30px;
  margin: 20px auto;
  border: 1px solid #000;
  text-align: center;
  border-radius: 5px;
  background-color: rgba(156, 156, 156, .5);
  cursor: pointer;
}

.flag {
  cursor: pointer;
}